JSFiddle - React, Tailwind, and code Playground

by JoeQuery

HTML

<body>
    <h1>Check to see if you have entered a valid number.</h1>
    <button onclick="numberValidator();">Check</button>
    <script src="main.js"></script>
</body>

JavaScript

function numberValidator() {
    function changeToNum(number) {
        Number(number);
        return number;
    }
    var number = prompt("Please enter (what you think) is a number.");
    var numberFinal = Number(number);
    if (isNaN(numberFinal)) {
     alert("That is not a valid number. Duh.");  
    } else {
    alert("Horray! " + "\""numberFinal + "\"" + " is a valid number!");
    }
}